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Ubuntu 20.04 Kubernetes #2 クラスター構築

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概要

Kubernetesクラスターを構築します。

参考資料

https://kubernetes.io/ja/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/
https://projectcalico.docs.tigera.io/getting-started/kubernetes/quickstart

前提条件

OS

Ubuntu 20.04を使用します。

コントロールプレーンノードの初期化

myadmin@ubuntu:~$ sudo kubeadm init --pod-network-cidr=192.168.80.0/24
[init] Using Kubernetes version: v1.23.5
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.66.160]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.66.160 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.66.160 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 17.003461 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.23" in namespace kube-system with the configuration for the kubelets in the cluster
NOTE: The "kubelet-config-1.23" naming of the kubelet ConfigMap is deprecated. Once the UnversionedKubeletConfigMap feature gate graduates to Beta the default name will become just "kubelet-config". Kubeadm upgrade will handle this transition transparently.
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node k8s-master as control-plane by adding the labels: [node-role.kubernetes.io/master(deprecated) node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node k8s-master as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: xy5ie7.sz5w21mit274efnk
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.66.160:6443 --token xy5ie7.sz5w21mit274efnk \
        --discovery-token-ca-cert-hash sha256:fa8450ba8a085909b18030c4f6e50e0a7588fd6d34bc3c4f9e640e6f695ff062
myadmin@ubuntu:~$ mkdir -p $HOME/.kube
myadmin@ubuntu:~$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
myadmin@ubuntu:~$ sudo chown $(id -u):$(id -g) $HOME/.kube/config

Podネットワークアドオンのインストール

myadmin@ubuntu:~$ kubectl create -f https://projectcalico.docs.tigera.io/manifests/tigera-operator.yaml
myadmin@ubuntu:~$ curl -OL https://docs.projectcalico.org/manifests/custom-resources.yaml
myadmin@ubuntu:~$ vim custom-resources.yaml

apiVersion: operator.tigera.io/v1
kind: Installation
metadata:
  name: default
spec:
  # Configures Calico networking.
  calicoNetwork:
    # Note: The ipPools section cannot be modified post-install.
    ipPools:
    - blockSize: 26
      cidr: 192.168.80.0/24
      encapsulation: VXLANCrossSubnet
      natOutgoing: Enabled
      nodeSelector: all()

myadmin@ubuntu:~$ kubectl create -f custom-resources.yaml

installation.operator.tigera.io/default created
apiserver.operator.tigera.io/default created
myadmin@master:~$ kubectl get all -A
NAMESPACE          NAME                                           READY   STATUS    RESTARTS   AGE
calico-apiserver   pod/calico-apiserver-647555d997-82648          1/1     Running   0          18m
calico-apiserver   pod/calico-apiserver-647555d997-ksh8f          1/1     Running   0          18m
calico-system      pod/calico-kube-controllers-67f85d7449-c4rlk   1/1     Running   0          20m
calico-system      pod/calico-node-427rk                          1/1     Running   0          9m50s
calico-system      pod/calico-node-rrhtt                          1/1     Running   0          20m
calico-system      pod/calico-typha-6cfb65854b-ht4n9              1/1     Running   0          20m
kube-system        pod/coredns-64897985d-84bww                    1/1     Running   0          30m
kube-system        pod/coredns-64897985d-xkts9                    1/1     Running   0          30m
kube-system        pod/etcd-k8s-master                            1/1     Running   0          30m
kube-system        pod/kube-apiserver-k8s-master                  1/1     Running   0          30m
kube-system        pod/kube-controller-manager-k8s-master         1/1     Running   0          30m
kube-system        pod/kube-proxy-sbt2c                           1/1     Running   0          9m50s
kube-system        pod/kube-proxy-x2clh                           1/1     Running   0          30m
kube-system        pod/kube-scheduler-k8s-master                  1/1     Running   0          30m
tigera-operator    pod/tigera-operator-b876f5799-kqvmv            1/1     Running   0          24m

NAMESPACE          NAME                                      TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                  AGE
calico-apiserver   service/calico-api                        ClusterIP   10.96.95.54              443/TCP                  18m
calico-system      service/calico-kube-controllers-metrics   ClusterIP   10.111.158.187           9094/TCP                 18m
calico-system      service/calico-typha                      ClusterIP   10.106.75.202            5473/TCP                 20m
default            service/kubernetes                        ClusterIP   10.96.0.1                443/TCP                  30m
kube-system        service/kube-dns                          ClusterIP   10.96.0.10               53/UDP,53/TCP,9153/TCP   30m

NAMESPACE       NAME                         DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR            AGE
calico-system   daemonset.apps/calico-node   2         2         2       2            2           kubernetes.io/os=linux   20m
kube-system     daemonset.apps/kube-proxy    2         2         2       2            2           kubernetes.io/os=linux   30m

NAMESPACE          NAME                                      READY   UP-TO-DATE   AVAILABLE   AGE
calico-apiserver   deployment.apps/calico-apiserver          2/2     2            2           18m
calico-system      deployment.apps/calico-kube-controllers   1/1     1            1           20m
calico-system      deployment.apps/calico-typha              1/1     1            1           20m
kube-system        deployment.apps/coredns                   2/2     2            2           30m
tigera-operator    deployment.apps/tigera-operator           1/1     1            1           24m

NAMESPACE          NAME                                                 DESIRED   CURRENT   READY   AGE
calico-apiserver   replicaset.apps/calico-apiserver-647555d997          2         2         2       18m
calico-system      replicaset.apps/calico-kube-controllers-67f85d7449   1         1         1       20m
calico-system      replicaset.apps/calico-typha-6cfb65854b              1         1         1       20m
kube-system        replicaset.apps/coredns-64897985d                    2         2         2       30m
tigera-operator    replicaset.apps/tigera-operator-b876f5799            1         1         1       24m

ノードの追加

myadmin@worker:~$ sudo kubeadm join 192.168.66.160:6443 --token xy5ie7.sz5w21mit274efnk --discovery-token-ca-cert-hash sha256:fa8450ba8a085909b18030c4f6e50e0a7588fd6d34bc3c4f9e640e6f695ff062
myadmin@master:~$ kubectl get node
NAME         STATUS   ROLES                  AGE     VERSION
k8s-master   Ready    control-plane,master   28m     v1.23.5
k8s-worker   Ready                     7m59s   v1.23.5

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Ubuntu 20.04 Kubernetes #2 クラスター構築

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